Abstract: A bandwidth adjusting access point 10 allocates a bandwidth to transfer data input via the internet 1000 and transfers the transfer data to information processing apparatuses 10201 to 10204. When new transfer data is input to the bandwidth adjusting access point 10, the bandwidth adjusting access point 10 determines whether the new transfer data can be transferred by comparing its own available bandwidth with a required bandwidth, which is set in the new transfer data by servers 151 to 154 and indicates a bandwidth required for transfer. When the new data cannot be transferred, the bandwidth adjusting access point 10 reduces a bandwidth of transfer data which is being transferred, based on a priority and a media type, which are embedded in the new transfer data, so a store serve a bandwidth for the new transfer data. Thus, even when a bandwidth of a LAN system becomes congested, a transfer rate for transfer data, which requires a broad bandwidth, is guaranteed.